arch/i386/Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see Documentation/kbuild/kconfig-language.txt.
   4 #
   5
   6 mainmenu "Linux Kernel Configuration"
   7
   8 config X86
   9         bool
  10         default y
  11         help
  12           This is Linux's home port.  Linux was originally native to the Intel
  13           386, and runs on all the later x86 processors including the Intel
  14           486, 586, Pentiums, and various instruction-set-compatible chips by
  15           AMD, Cyrix, and others.
  16
  17 config SEMAPHORE_SLEEPERS
  18         bool
  19         default y
  20
  21 config MMU
  22         bool
  23         default y
  24
  25 config SBUS
  26         bool
  27
  28 config UID16
  29         bool
  30         default y
  31
  32 config GENERIC_ISA_DMA
  33         bool
  34         default y
  35
  36 config GENERIC_IOMAP
  37         bool
  38         default y
  39
  40 config ARCH_MAY_HAVE_PC_FDC
  41         bool
  42         default y
  43
  44 source "init/Kconfig"
  45
  46 menu "Processor type and features"
  47
  48 choice
  49         prompt "Subarchitecture Type"
  50         default X86_PC
  51
  52 config X86_PC
  53         bool "PC-compatible"
  54         help
  55           Choose this option if your computer is a standard PC or compatible.
  56
  57 config X86_ELAN
  58         bool "AMD Elan"
  59         help
  60           Select this for an AMD Elan processor.
  61
  62           Do not use this option for K6/Athlon/Opteron processors!
  63
  64           If unsure, choose "PC-compatible" instead.
  65
  66 config X86_VOYAGER
  67         bool "Voyager (NCR)"
  68         help
  69           Voyager is an MCA-based 32-way capable SMP architecture proprietary
  70           to NCR Corp.  Machine classes 345x/35xx/4100/51xx are Voyager-based.
  71
  72           *** WARNING ***
  73
  74           If you do not specifically know you have a Voyager based machine,
  75           say N here, otherwise the kernel you build will not be bootable.
  76
  77 config X86_NUMAQ
  78         bool "NUMAQ (IBM/Sequent)"
  79         select NUMA
  80         help
  81           This option is used for getting Linux to run on a (IBM/Sequent) NUMA
  82           multiquad box. This changes the way that processors are bootstrapped,
  83           and uses Clustered Logical APIC addressing mode instead of Flat Logical.
  84           You will need a new lynxer.elf file to flash your firmware with - send
  85           email to <Martin.Bligh@us.ibm.com>.
  86
  87 config X86_SUMMIT
  88         bool "Summit/EXA (IBM x440)"
  89         depends on SMP
  90         help
  91           This option is needed for IBM systems that use the Summit/EXA chipset.
  92           In particular, it is needed for the x440.
  93
  94           If you don't have one of these computers, you should say N here.
  95
  96 config X86_BIGSMP
  97         bool "Support for other sub-arch SMP systems with more than 8 CPUs"
  98         depends on SMP
  99         help
 100           This option is needed for the systems that have more than 8 CPUs
 101           and if the system is not of any sub-arch type above.
 102
 103           If you don't have such a system, you should say N here.
 104
 105 config X86_VISWS
 106         bool "SGI 320/540 (Visual Workstation)"
 107         help
 108           The SGI Visual Workstation series is an IA32-based workstation
 109           based on SGI systems chips with some legacy PC hardware attached.
 110
 111           Say Y here to create a kernel to run on the SGI 320 or 540.
 112
 113           A kernel compiled for the Visual Workstation will not run on PCs
 114           and vice versa. See <file:Documentation/sgi-visws.txt> for details.
 115
 116 config X86_GENERICARCH
 117        bool "Generic architecture (Summit, bigsmp, ES7000, default)"
 118        depends on SMP
 119        help
 120           This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
 121           It is intended for a generic binary kernel.
 122
 123 config X86_ES7000
 124         bool "Support for Unisys ES7000 IA32 series"
 125         depends on SMP
 126         help
 127           Support for Unisys ES7000 systems.  Say 'Y' here if this kernel is
 128           supposed to run on an IA32-based Unisys ES7000 system.
 129           Only choose this option if you have such a system, otherwise you
 130           should say N here.
 131
 132 endchoice
 133
 134 config ACPI_SRAT
 135         bool
 136         default y
 137         depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
 138
 139 config X86_SUMMIT_NUMA
 140         bool
 141         default y
 142         depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
 143
 144 config X86_CYCLONE_TIMER
 145         bool
 146         default y
 147         depends on X86_SUMMIT || X86_GENERICARCH
 148
 149 config ES7000_CLUSTERED_APIC
 150         bool
 151         default y
 152         depends on SMP && X86_ES7000 && MPENTIUMIII
 153
 154 if !X86_ELAN
 155
 156 choice
 157         prompt "Processor family"
 158         default M686
 159
 160 config M386
 161         bool "386"
 162         ---help---
 163           This is the processor type of your CPU. This information is used for
 164           optimizing purposes. In order to compile a kernel that can run on
 165           all x86 CPU types (albeit not optimally fast), you can specify
 166           "386" here.
 167
 168           The kernel will not necessarily run on earlier architectures than
 169           the one you have chosen, e.g. a Pentium optimized kernel will run on
 170           a PPro, but not necessarily on a i486.
 171
 172           Here are the settings recommended for greatest speed:
 173           - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
 174           486DLC/DLC2, UMC 486SX-S and NexGen Nx586.  Only "386" kernels
 175           will run on a 386 class machine.
 176           - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
 177           SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
 178           - "586" for generic Pentium CPUs lacking the TSC
 179           (time stamp counter) register.
 180           - "Pentium-Classic" for the Intel Pentium.
 181           - "Pentium-MMX" for the Intel Pentium MMX.
 182           - "Pentium-Pro" for the Intel Pentium Pro.
 183           - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
 184           - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
 185           - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
 186           - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
 187           - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
 188           - "Crusoe" for the Transmeta Crusoe series.
 189           - "Efficeon" for the Transmeta Efficeon series.
 190           - "Winchip-C6" for original IDT Winchip.
 191           - "Winchip-2" for IDT Winchip 2.
 192           - "Winchip-2A" for IDT Winchips with 3dNow! capabilities.
 193           - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
 194           - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
 195           - "VIA C3-2 for VIA C3-2 "Nehemiah" (model 9 and above).
 196
 197           If you don't know what to do, choose "386".
 198
 199 config M486
 200         bool "486"
 201         help
 202           Select this for a 486 series processor, either Intel or one of the
 203           compatible processors from AMD, Cyrix, IBM, or Intel.  Includes DX,
 204           DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
 205           U5S.
 206
 207 config M586
 208         bool "586/K5/5x86/6x86/6x86MX"
 209         help
 210           Select this for an 586 or 686 series processor such as the AMD K5,
 211           the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
 212           assume the RDTSC (Read Time Stamp Counter) instruction.
 213
 214 config M586TSC
 215         bool "Pentium-Classic"
 216         help
 217           Select this for a Pentium Classic processor with the RDTSC (Read
 218           Time Stamp Counter) instruction for benchmarking.
 219
 220 config M586MMX
 221         bool "Pentium-MMX"
 222         help
 223           Select this for a Pentium with the MMX graphics/multimedia
 224           extended instructions.
 225
 226 config M686
 227         bool "Pentium-Pro"
 228         help
 229           Select this for Intel Pentium Pro chips.  This enables the use of
 230           Pentium Pro extended instructions, and disables the init-time guard
 231           against the f00f bug found in earlier Pentiums.
 232
 233 config MPENTIUMII
 234         bool "Pentium-II/Celeron(pre-Coppermine)"
 235         help
 236           Select this for Intel chips based on the Pentium-II and
 237           pre-Coppermine Celeron core.  This option enables an unaligned
 238           copy optimization, compiles the kernel with optimization flags
 239           tailored for the chip, and applies any applicable Pentium Pro
 240           optimizations.
 241
 242 config MPENTIUMIII
 243         bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
 244         help
 245           Select this for Intel chips based on the Pentium-III and
 246           Celeron-Coppermine core.  This option enables use of some
 247           extended prefetch instructions in addition to the Pentium II
 248           extensions.
 249
 250 config MPENTIUMM
 251         bool "Pentium M"
 252         help
 253           Select this for Intel Pentium M (not Pentium-4 M)
 254           notebook chips.
 255
 256 config MPENTIUM4
 257         bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/Xeon"
 258         help
 259           Select this for Intel Pentium 4 chips.  This includes the
 260           Pentium 4, P4-based Celeron and Xeon, and Pentium-4 M
 261           (not Pentium M) chips.  This option enables compile flags
 262           optimized for the chip, uses the correct cache shift, and
 263           applies any applicable Pentium III optimizations.
 264
 265 config MK6
 266         bool "K6/K6-II/K6-III"
 267         help
 268           Select this for an AMD K6-family processor.  Enables use of
 269           some extended instructions, and passes appropriate optimization
 270           flags to GCC.
 271
 272 config MK7
 273         bool "Athlon/Duron/K7"
 274         help
 275           Select this for an AMD Athlon K7-family processor.  Enables use of
 276           some extended instructions, and passes appropriate optimization
 277           flags to GCC.
 278
 279 config MK8
 280         bool "Opteron/Athlon64/Hammer/K8"
 281         help
 282           Select this for an AMD Opteron or Athlon64 Hammer-family processor.  Enables
 283           use of some extended instructions, and passes appropriate optimization
 284           flags to GCC.
 285
 286 config MCRUSOE
 287         bool "Crusoe"
 288         help
 289           Select this for a Transmeta Crusoe processor.  Treats the processor
 290           like a 586 with TSC, and sets some GCC optimization flags (like a
 291           Pentium Pro with no alignment requirements).
 292
 293 config MEFFICEON
 294         bool "Efficeon"
 295         help
 296           Select this for a Transmeta Efficeon processor.
 297
 298 config MWINCHIPC6
 299         bool "Winchip-C6"
 300         help
 301           Select this for an IDT Winchip C6 chip.  Linux and GCC
 302           treat this chip as a 586TSC with some extended instructions
 303           and alignment requirements.
 304
 305 config MWINCHIP2
 306         bool "Winchip-2"
 307         help
 308           Select this for an IDT Winchip-2.  Linux and GCC
 309           treat this chip as a 586TSC with some extended instructions
 310           and alignment requirements.
 311
 312 config MWINCHIP3D
 313         bool "Winchip-2A/Winchip-3"
 314         help
 315           Select this for an IDT Winchip-2A or 3.  Linux and GCC
 316           treat this chip as a 586TSC with some extended instructions
 317           and alignment reqirements.  Also enable out of order memory
 318           stores for this CPU, which can increase performance of some
 319           operations.
 320
 321 config MGEODEGX1
 322         bool "GeodeGX1"
 323         help
 324           Select this for a Geode GX1 (Cyrix MediaGX) chip.
 325
 326 config MCYRIXIII
 327         bool "CyrixIII/VIA-C3"
 328         help
 329           Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
 330           treat this chip as a generic 586. Whilst the CPU is 686 class,
 331           it lacks the cmov extension which gcc assumes is present when
 332           generating 686 code.
 333           Note that Nehemiah (Model 9) and above will not boot with this
 334           kernel due to them lacking the 3DNow! instructions used in earlier
 335           incarnations of the CPU.
 336
 337 config MVIAC3_2
 338         bool "VIA C3-2 (Nehemiah)"
 339         help
 340           Select this for a VIA C3 "Nehemiah". Selecting this enables usage
 341           of SSE and tells gcc to treat the CPU as a 686.
 342           Note, this kernel will not boot on older (pre model 9) C3s.
 343
 344 endchoice
 345
 346 config X86_GENERIC
 347        bool "Generic x86 support"
 348        help
 349           Instead of just including optimizations for the selected
 350           x86 variant (e.g. PII, Crusoe or Athlon), include some more
 351           generic optimizations as well. This will make the kernel
 352           perform better on x86 CPUs other than that selected.
 353
 354           This is really intended for distributors who need more
 355           generic optimizations.
 356
 357 endif
 358
 359 #
 360 # Define implied options from the CPU selection here
 361 #
 362 config X86_CMPXCHG
 363         bool
 364         depends on !M386
 365         default y
 366
 367 config X86_XADD
 368         bool
 369         depends on !M386
 370         default y
 371
 372 config X86_L1_CACHE_SHIFT
 373         int
 374         default "7" if MPENTIUM4 || X86_GENERIC
 375         default "4" if X86_ELAN || M486 || M386
 376         default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODEGX1
 377         default "6" if MK7 || MK8 || MPENTIUMM
 378
 379 config RWSEM_GENERIC_SPINLOCK
 380         bool
 381         depends on M386
 382         default y
 383
 384 config RWSEM_XCHGADD_ALGORITHM
 385         bool
 386         depends on !M386
 387         default y
 388
 389 config GENERIC_CALIBRATE_DELAY
 390         bool
 391         default y
 392
 393 config X86_PPRO_FENCE
 394         bool
 395         depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
 396         default y
 397
 398 config X86_F00F_BUG
 399         bool
 400         depends on M586MMX || M586TSC || M586 || M486 || M386
 401         default y
 402
 403 config X86_WP_WORKS_OK
 404         bool
 405         depends on !M386
 406         default y
 407
 408 config X86_INVLPG
 409         bool
 410         depends on !M386
 411         default y
 412
 413 config X86_BSWAP
 414         bool
 415         depends on !M386
 416         default y
 417
 418 config X86_POPAD_OK
 419         bool
 420         depends on !M386
 421         default y
 422
 423 config X86_ALIGNMENT_16
 424         bool
 425         depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
 426         default y
 427
 428 config X86_GOOD_APIC
 429         bool
 430         depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON
 431         default y
 432
 433 config X86_INTEL_USERCOPY
 434         bool
 435         depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON
 436         default y
 437
 438 config X86_USE_PPRO_CHECKSUM
 439         bool
 440         depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON
 441         default y
 442
 443 config X86_USE_3DNOW
 444         bool
 445         depends on MCYRIXIII || MK7
 446         default y
 447
 448 config X86_OOSTORE
 449         bool
 450         depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR
 451         default y
 452
 453 config HPET_TIMER
 454         bool "HPET Timer Support"
 455         help
 456           This enables the use of the HPET for the kernel's internal timer.
 457           HPET is the next generation timer replacing legacy 8254s.
 458           You can safely choose Y here.  However, HPET will only be
 459           activated if the platform and the BIOS support this feature.
 460           Otherwise the 8254 will be used for timing services.
 461
 462           Choose N to continue using the legacy 8254 timer.
 463
 464 config HPET_EMULATE_RTC
 465         bool
 466         depends on HPET_TIMER && RTC=y
 467         default y
 468
 469 config SMP
 470         bool "Symmetric multi-processing support"
 471         ---help---
 472           This enables support for systems with more than one CPU. If you have
 473           a system with only one CPU, like most personal computers, say N. If
 474           you have a system with more than one CPU, say Y.
 475
 476           If you say N here, the kernel will run on single and multiprocessor
 477           machines, but will use only one CPU of a multiprocessor machine. If
 478           you say Y here, the kernel will run on many, but not all,
 479           singleprocessor machines. On a singleprocessor machine, the kernel
 480           will run faster if you say N here.
 481
 482           Note that if you say Y here and choose architecture "586" or
 483           "Pentium" under "Processor family", the kernel will not work on 486
 484           architectures. Similarly, multiprocessor kernels for the "PPro"
 485           architecture may not work on all Pentium based boards.
 486
 487           People using multiprocessor machines who say Y here should also say
 488           Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
 489           Management" code will be disabled if you say Y here.
 490
 491           See also the <file:Documentation/smp.txt>,
 492           <file:Documentation/i386/IO-APIC.txt>,
 493           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 494           <http://www.tldp.org/docs.html#howto>.
 495
 496           If you don't know what to do here, say N.
 497
 498 config NR_CPUS
 499         int "Maximum number of CPUs (2-255)"
 500         range 2 255
 501         depends on SMP
 502         default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
 503         default "8"
 504         help
 505           This allows you to specify the maximum number of CPUs which this
 506           kernel will support.  The maximum supported value is 255 and the
 507           minimum value which makes sense is 2.
 508
 509           This is purely to save memory - each supported CPU adds
 510           approximately eight kilobytes to the kernel image.
 511
 512 config SCHED_SMT
 513         bool "SMT (Hyperthreading) scheduler support"
 514         depends on SMP
 515         default off
 516         help
 517           SMT scheduler support improves the CPU scheduler's decision making
 518           when dealing with Intel Pentium 4 chips with HyperThreading at a
 519           cost of slightly increased overhead in some places. If unsure say
 520           N here.
 521
 522 source "kernel/Kconfig.preempt"
 523
 524 config X86_UP_APIC
 525         bool "Local APIC support on uniprocessors"
 526         depends on !SMP && !(X86_VISWS || X86_VOYAGER)
 527         help
 528           A local APIC (Advanced Programmable Interrupt Controller) is an
 529           integrated interrupt controller in the CPU. If you have a single-CPU
 530           system which has a processor with a local APIC, you can say Y here to
 531           enable and use it. If you say Y here even though your machine doesn't
 532           have a local APIC, then the kernel will still run with no slowdown at
 533           all. The local APIC supports CPU-generated self-interrupts (timer,
 534           performance counters), and the NMI watchdog which detects hard
 535           lockups.
 536
 537 config X86_UP_IOAPIC
 538         bool "IO-APIC support on uniprocessors"
 539         depends on X86_UP_APIC
 540         help
 541           An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
 542           SMP-capable replacement for PC-style interrupt controllers. Most
 543           SMP systems and many recent uniprocessor systems have one.
 544
 545           If you have a single-CPU system with an IO-APIC, you can say Y here
 546           to use it. If you say Y here even though your machine doesn't have
 547           an IO-APIC, then the kernel will still run with no slowdown at all.
 548
 549 config X86_LOCAL_APIC
 550         bool
 551         depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER)
 552         default y
 553
 554 config X86_IO_APIC
 555         bool
 556         depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER))
 557         default y
 558
 559 config X86_VISWS_APIC
 560         bool
 561         depends on X86_VISWS
 562         default y
 563
 564 config X86_TSC
 565         bool
 566         depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MGEODEGX1) && !X86_NUMAQ
 567         default y
 568
 569 config X86_MCE
 570         bool "Machine Check Exception"
 571         depends on !X86_VOYAGER
 572         ---help---
 573           Machine Check Exception support allows the processor to notify the
 574           kernel if it detects a problem (e.g. overheating, component failure).
 575           The action the kernel takes depends on the severity of the problem,
 576           ranging from a warning message on the console, to halting the machine.
 577           Your processor must be a Pentium or newer to support this - check the
 578           flags in /proc/cpuinfo for mce.  Note that some older Pentium systems
 579           have a design flaw which leads to false MCE events - hence MCE is
 580           disabled on all P5 processors, unless explicitly enabled with "mce"
 581           as a boot argument.  Similarly, if MCE is built in and creates a
 582           problem on some new non-standard machine, you can boot with "nomce"
 583           to disable it.  MCE support simply ignores non-MCE processors like
 584           the 386 and 486, so nearly everyone can say Y here.
 585
 586 config X86_MCE_NONFATAL
 587         tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
 588         depends on X86_MCE
 589         help
 590           Enabling this feature starts a timer that triggers every 5 seconds which
 591           will look at the machine check registers to see if anything happened.
 592           Non-fatal problems automatically get corrected (but still logged).
 593           Disable this if you don't want to see these messages.
 594           Seeing the messages this option prints out may be indicative of dying hardware,
 595           or out-of-spec (ie, overclocked) hardware.
 596           This option only does something on certain CPUs.
 597           (AMD Athlon/Duron and Intel Pentium 4)
 598
 599 config X86_MCE_P4THERMAL
 600         bool "check for P4 thermal throttling interrupt."
 601         depends on X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
 602         help
 603           Enabling this feature will cause a message to be printed when the P4
 604           enters thermal throttling.
 605
 606 config TOSHIBA
 607         tristate "Toshiba Laptop support"
 608         ---help---
 609           This adds a driver to safely access the System Management Mode of
 610           the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
 611           not work on models with a Phoenix BIOS. The System Management Mode
 612           is used to set the BIOS and power saving options on Toshiba portables.
 613
 614           For information on utilities to make use of this driver see the
 615           Toshiba Linux utilities web site at:
 616           <http://www.buzzard.org.uk/toshiba/>.
 617
 618           Say Y if you intend to run this kernel on a Toshiba portable.
 619           Say N otherwise.
 620
 621 config I8K
 622         tristate "Dell laptop support"
 623         ---help---
 624           This adds a driver to safely access the System Management Mode
 625           of the CPU on the Dell Inspiron 8000. The System Management Mode
 626           is used to read cpu temperature and cooling fan status and to
 627           control the fans on the I8K portables.
 628
 629           This driver has been tested only on the Inspiron 8000 but it may
 630           also work with other Dell laptops. You can force loading on other
 631           models by passing the parameter `force=1' to the module. Use at
 632           your own risk.
 633
 634           For information on utilities to make use of this driver see the
 635           I8K Linux utilities web site at:
 636           <http://people.debian.org/~dz/i8k/>
 637
 638           Say Y if you intend to run this kernel on a Dell Inspiron 8000.
 639           Say N otherwise.
 640
 641 config X86_REBOOTFIXUPS
 642         bool "Enable X86 board specific fixups for reboot"
 643         depends on X86
 644         default n
 645         ---help---
 646           This enables chipset and/or board specific fixups to be done
 647           in order to get reboot to work correctly. This is only needed on
 648           some combinations of hardware and BIOS. The symptom, for which
 649           this config is intended, is when reboot ends with a stalled/hung
 650           system.
 651
 652           Currently, the only fixup is for the Geode GX1/CS5530A/TROM2.1.
 653           combination.
 654
 655           Say Y if you want to enable the fixup. Currently, it's safe to
 656           enable this option even if you don't need it.
 657           Say N otherwise.
 658
 659 config MICROCODE
 660         tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
 661         ---help---
 662           If you say Y here and also to "/dev file system support" in the
 663           'File systems' section, you will be able to update the microcode on
 664           Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
 665           Pentium III, Pentium 4, Xeon etc.  You will obviously need the
 666           actual microcode binary data itself which is not shipped with the
 667           Linux kernel.
 668
 669           For latest news and information on obtaining all the required
 670           ingredients for this driver, check:
 671           <http://www.urbanmyth.org/microcode/>.
 672
 673           To compile this driver as a module, choose M here: the
 674           module will be called microcode.
 675
 676 config X86_MSR
 677         tristate "/dev/cpu/*/msr - Model-specific register support"
 678         help
 679           This device gives privileged processes access to the x86
 680           Model-Specific Registers (MSRs).  It is a character device with
 681           major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
 682           MSR accesses are directed to a specific CPU on multi-processor
 683           systems.
 684
 685 config X86_CPUID
 686         tristate "/dev/cpu/*/cpuid - CPU information support"
 687         help
 688           This device gives processes access to the x86 CPUID instruction to
 689           be executed on a specific processor.  It is a character device
 690           with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
 691           /dev/cpu/31/cpuid.
 692
 693 source "drivers/firmware/Kconfig"
 694
 695 choice
 696         prompt "High Memory Support"
 697         default NOHIGHMEM
 698
 699 config NOHIGHMEM
 700         bool "off"
 701         ---help---
 702           Linux can use up to 64 Gigabytes of physical memory on x86 systems.
 703           However, the address space of 32-bit x86 processors is only 4
 704           Gigabytes large. That means that, if you have a large amount of
 705           physical memory, not all of it can be "permanently mapped" by the
 706           kernel. The physical memory that's not permanently mapped is called
 707           "high memory".
 708
 709           If you are compiling a kernel which will never run on a machine with
 710           more than 1 Gigabyte total physical RAM, answer "off" here (default
 711           choice and suitable for most users). This will result in a "3GB/1GB"
 712           split: 3GB are mapped so that each process sees a 3GB virtual memory
 713           space and the remaining part of the 4GB virtual memory space is used
 714           by the kernel to permanently map as much physical memory as
 715           possible.
 716
 717           If the machine has between 1 and 4 Gigabytes physical RAM, then
 718           answer "4GB" here.
 719
 720           If more than 4 Gigabytes is used then answer "64GB" here. This
 721           selection turns Intel PAE (Physical Address Extension) mode on.
 722           PAE implements 3-level paging on IA32 processors. PAE is fully
 723           supported by Linux, PAE mode is implemented on all recent Intel
 724           processors (Pentium Pro and better). NOTE: If you say "64GB" here,
 725           then the kernel will not boot on CPUs that don't support PAE!
 726
 727           The actual amount of total physical memory will either be
 728           auto detected or can be forced by using a kernel command line option
 729           such as "mem=256M". (Try "man bootparam" or see the documentation of
 730           your boot loader (lilo or loadlin) about how to pass options to the
 731           kernel at boot time.)
 732
 733           If unsure, say "off".
 734
 735 config HIGHMEM4G
 736         bool "4GB"
 737         help
 738           Select this if you have a 32-bit processor and between 1 and 4
 739           gigabytes of physical RAM.
 740
 741 config HIGHMEM64G
 742         bool "64GB"
 743         help
 744           Select this if you have a 32-bit processor and more than 4
 745           gigabytes of physical RAM.
 746
 747 endchoice
 748
 749 config HIGHMEM
 750         bool
 751         depends on HIGHMEM64G || HIGHMEM4G
 752         default y
 753
 754 config X86_PAE
 755         bool
 756         depends on HIGHMEM64G
 757         default y
 758
 759 # Common NUMA Features
 760 config NUMA
 761         bool "Numa Memory Allocation and Scheduler Support"
 762         depends on SMP && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI))
 763         default n if X86_PC
 764         default y if (X86_NUMAQ || X86_SUMMIT)
 765         select SPARSEMEM_STATIC
 766
 767 # Need comments to help the hapless user trying to turn on NUMA support
 768 comment "NUMA (NUMA-Q) requires SMP, 64GB highmem support"
 769         depends on X86_NUMAQ && (!HIGHMEM64G || !SMP)
 770
 771 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
 772         depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)
 773
 774 config HAVE_ARCH_BOOTMEM_NODE
 775         bool
 776         depends on NUMA
 777         default y
 778
 779 config ARCH_HAVE_MEMORY_PRESENT
 780         bool
 781         depends on DISCONTIGMEM
 782         default y
 783
 784 config NEED_NODE_MEMMAP_SIZE
 785         bool
 786         depends on DISCONTIGMEM || SPARSEMEM
 787         default y
 788
 789 config HAVE_ARCH_ALLOC_REMAP
 790         bool
 791         depends on NUMA
 792         default y
 793
 794 config ARCH_DISCONTIGMEM_ENABLE
 795         def_bool y
 796         depends on NUMA
 797
 798 config ARCH_DISCONTIGMEM_DEFAULT
 799         def_bool y
 800         depends on NUMA
 801
 802 config ARCH_SPARSEMEM_ENABLE
 803         def_bool y
 804         depends on NUMA
 805
 806 config ARCH_SELECT_MEMORY_MODEL
 807         def_bool y
 808         depends on ARCH_SPARSEMEM_ENABLE
 809
 810 source "mm/Kconfig"
 811
 812 config HAVE_ARCH_EARLY_PFN_TO_NID
 813         bool
 814         default y
 815         depends on NUMA
 816
 817 config HIGHPTE
 818         bool "Allocate 3rd-level pagetables from highmem"
 819         depends on HIGHMEM4G || HIGHMEM64G
 820         help
 821           The VM uses one page table entry for each page of physical memory.
 822           For systems with a lot of RAM, this can be wasteful of precious
 823           low memory.  Setting this option will put user-space page table
 824           entries in high memory.
 825
 826 config MATH_EMULATION
 827         bool "Math emulation"
 828         ---help---
 829           Linux can emulate a math coprocessor (used for floating point
 830           operations) if you don't have one. 486DX and Pentium processors have
 831           a math coprocessor built in, 486SX and 386 do not, unless you added
 832           a 487DX or 387, respectively. (The messages during boot time can
 833           give you some hints here ["man dmesg"].) Everyone needs either a
 834           coprocessor or this emulation.
 835
 836           If you don't have a math coprocessor, you need to say Y here; if you
 837           say Y here even though you have a coprocessor, the coprocessor will
 838           be used nevertheless. (This behavior can be changed with the kernel
 839           command line option "no387", which comes handy if your coprocessor
 840           is broken. Try "man bootparam" or see the documentation of your boot
 841           loader (lilo or loadlin) about how to pass options to the kernel at
 842           boot time.) This means that it is a good idea to say Y here if you
 843           intend to use this kernel on different machines.
 844
 845           More information about the internals of the Linux math coprocessor
 846           emulation can be found in <file:arch/i386/math-emu/README>.
 847
 848           If you are not sure, say Y; apart from resulting in a 66 KB bigger
 849           kernel, it won't hurt.
 850
 851 config MTRR
 852         bool "MTRR (Memory Type Range Register) support"
 853         ---help---
 854           On Intel P6 family processors (Pentium Pro, Pentium II and later)
 855           the Memory Type Range Registers (MTRRs) may be used to control
 856           processor access to memory ranges. This is most useful if you have
 857           a video (VGA) card on a PCI or AGP bus. Enabling write-combining
 858           allows bus write transfers to be combined into a larger transfer
 859           before bursting over the PCI/AGP bus. This can increase performance
 860           of image write operations 2.5 times or more. Saying Y here creates a
 861           /proc/mtrr file which may be used to manipulate your processor's
 862           MTRRs. Typically the X server should use this.
 863
 864           This code has a reasonably generic interface so that similar
 865           control registers on other processors can be easily supported
 866           as well:
 867
 868           The Cyrix 6x86, 6x86MX and M II processors have Address Range
 869           Registers (ARRs) which provide a similar functionality to MTRRs. For
 870           these, the ARRs are used to emulate the MTRRs.
 871           The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
 872           MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
 873           write-combining. All of these processors are supported by this code
 874           and it makes sense to say Y here if you have one of them.
 875
 876           Saying Y here also fixes a problem with buggy SMP BIOSes which only
 877           set the MTRRs for the boot CPU and not for the secondary CPUs. This
 878           can lead to all sorts of problems, so it's good to say Y here.
 879
 880           You can safely say Y even if your machine doesn't have MTRRs, you'll
 881           just add about 9 KB to your kernel.
 882
 883           See <file:Documentation/mtrr.txt> for more information.
 884
 885 config EFI
 886         bool "Boot from EFI support (EXPERIMENTAL)"
 887         depends on ACPI
 888         default n
 889         ---help---
 890         This enables the the kernel to boot on EFI platforms using
 891         system configuration information passed to it from the firmware.
 892         This also enables the kernel to use any EFI runtime services that are
 893         available (such as the EFI variable services).
 894
 895         This option is only useful on systems that have EFI firmware
 896         and will result in a kernel image that is ~8k larger.  In addition,
 897         you must use the latest ELILO loader available at
 898         <http://elilo.sourceforge.net> in order to take advantage of
 899         kernel initialization using EFI information (neither GRUB nor LILO know
 900         anything about EFI).  However, even with this option, the resultant
 901         kernel should continue to boot on existing non-EFI platforms.
 902
 903 config IRQBALANCE
 904         bool "Enable kernel irq balancing"
 905         depends on SMP && X86_IO_APIC
 906         default y
 907         help
 908           The default yes will allow the kernel to do irq load balancing.
 909           Saying no will keep the kernel from doing irq load balancing.
 910
 911 # turning this on wastes a bunch of space.
 912 # Summit needs it only when NUMA is on
 913 config BOOT_IOREMAP
 914         bool
 915         depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
 916         default y
 917
 918 config REGPARM
 919         bool "Use register arguments (EXPERIMENTAL)"
 920         depends on EXPERIMENTAL
 921         default n
 922         help
 923         Compile the kernel with -mregparm=3. This uses a different ABI
 924         and passes the first three arguments of a function call in registers.
 925         This will probably break binary only modules.
 926
 927         This feature is only enabled for gcc-3.0 and later - earlier compilers
 928         generate incorrect output with certain kernel constructs when
 929         -mregparm=3 is used.
 930
 931 config SECCOMP
 932         bool "Enable seccomp to safely compute untrusted bytecode"
 933         depends on PROC_FS
 934         default y
 935         help
 936           This kernel feature is useful for number crunching applications
 937           that may need to compute untrusted bytecode during their
 938           execution. By using pipes or other transports made available to
 939           the process as file descriptors supporting the read/write
 940           syscalls, it's possible to isolate those applications in
 941           their own address space using seccomp. Once seccomp is
 942           enabled via /proc/<pid>/seccomp, it cannot be disabled
 943           and the task is only allowed to execute a few safe syscalls
 944           defined by each seccomp mode.
 945
 946           If unsure, say Y. Only embedded should say N here.
 947
 948 source kernel/Kconfig.hz
 949
 950 config PHYSICAL_START
 951         hex "Physical address where the kernel is loaded" if EMBEDDED
 952         default "0x100000"
 953         help
 954           This gives the physical address where the kernel is loaded.
 955           Primarily used in the case of kexec on panic where the
 956           fail safe kernel needs to run at a different address than
 957           the panic-ed kernel.
 958
 959           Don't change this unless you know what you are doing.
 960
 961 config KEXEC
 962         bool "kexec system call (EXPERIMENTAL)"
 963         depends on EXPERIMENTAL
 964         help
 965           kexec is a system call that implements the ability to shutdown your
 966           current kernel, and to start another kernel.  It is like a reboot
 967           but it is indepedent of the system firmware.   And like a reboot
 968           you can start any kernel with it, not just Linux.
 969
 970           The name comes from the similiarity to the exec system call.
 971
 972           It is an ongoing process to be certain the hardware in a machine
 973           is properly shutdown, so do not be surprised if this code does not
 974           initially work for you.  It may help to enable device hotplugging
 975           support.  As of this writing the exact hardware interface is
 976           strongly in flux, so no good recommendation can be made.
 977
 978 config CRASH_DUMP
 979         bool "kernel crash dumps (EXPERIMENTAL)"
 980         depends on EMBEDDED
 981         depends on EXPERIMENTAL
 982         depends on HIGHMEM
 983         help
 984           Generate crash dump after being started by kexec.
 985 endmenu
 986
 987
 988 menu "Power management options (ACPI, APM)"
 989         depends on !X86_VOYAGER
 990
 991 source kernel/power/Kconfig
 992
 993 source "drivers/acpi/Kconfig"
 994
 995 menu "APM (Advanced Power Management) BIOS Support"
 996 depends on PM && !X86_VISWS
 997
 998 config APM
 999         tristate "APM (Advanced Power Management) BIOS support"
1000         depends on PM
1001         ---help---
1002           APM is a BIOS specification for saving power using several different
1003           techniques. This is mostly useful for battery powered laptops with
1004           APM compliant BIOSes. If you say Y here, the system time will be
1005           reset after a RESUME operation, the /proc/apm device will provide
1006           battery status information, and user-space programs will receive
1007           notification of APM "events" (e.g. battery status change).
1008
1009           If you select "Y" here, you can disable actual use of the APM
1010           BIOS by passing the "apm=off" option to the kernel at boot time.
1011
1012           Note that the APM support is almost completely disabled for
1013           machines with more than one CPU.
1014
1015           In order to use APM, you will need supporting software. For location
1016           and more information, read <file:Documentation/pm.txt> and the
1017           Battery Powered Linux mini-HOWTO, available from
1018           <http://www.tldp.org/docs.html#howto>.
1019
1020           This driver does not spin down disk drives (see the hdparm(8)
1021           manpage ("man 8 hdparm") for that), and it doesn't turn off
1022           VESA-compliant "green" monitors.
1023
1024           This driver does not support the TI 4000M TravelMate and the ACER
1025           486/DX4/75 because they don't have compliant BIOSes. Many "green"
1026           desktop machines also don't have compliant BIOSes, and this driver
1027           may cause those machines to panic during the boot phase.
1028
1029           Generally, if you don't have a battery in your machine, there isn't
1030           much point in using this driver and you should say N. If you get
1031           random kernel OOPSes or reboots that don't seem to be related to
1032           anything, try disabling/enabling this option (or disabling/enabling
1033           APM in your BIOS).
1034
1035           Some other things you should try when experiencing seemingly random,
1036           "weird" problems:
1037
1038           1) make sure that you have enough swap space and that it is
1039           enabled.
1040           2) pass the "no-hlt" option to the kernel
1041           3) switch on floating point emulation in the kernel and pass
1042           the "no387" option to the kernel
1043           4) pass the "floppy=nodma" option to the kernel
1044           5) pass the "mem=4M" option to the kernel (thereby disabling
1045           all but the first 4 MB of RAM)
1046           6) make sure that the CPU is not over clocked.
1047           7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1048           8) disable the cache from your BIOS settings
1049           9) install a fan for the video card or exchange video RAM
1050           10) install a better fan for the CPU
1051           11) exchange RAM chips
1052           12) exchange the motherboard.
1053
1054           To compile this driver as a module, choose M here: the
1055           module will be called apm.
1056
1057 config APM_IGNORE_USER_SUSPEND
1058         bool "Ignore USER SUSPEND"
1059         depends on APM
1060         help
1061           This option will ignore USER SUSPEND requests. On machines with a
1062           compliant APM BIOS, you want to say N. However, on the NEC Versa M
1063           series notebooks, it is necessary to say Y because of a BIOS bug.
1064
1065 config APM_DO_ENABLE
1066         bool "Enable PM at boot time"
1067         depends on APM
1068         ---help---
1069           Enable APM features at boot time. From page 36 of the APM BIOS
1070           specification: "When disabled, the APM BIOS does not automatically
1071           power manage devices, enter the Standby State, enter the Suspend
1072           State, or take power saving steps in response to CPU Idle calls."
1073           This driver will make CPU Idle calls when Linux is idle (unless this
1074           feature is turned off -- see "Do CPU IDLE calls", below). This
1075           should always save battery power, but more complicated APM features
1076           will be dependent on your BIOS implementation. You may need to turn
1077           this option off if your computer hangs at boot time when using APM
1078           support, or if it beeps continuously instead of suspending. Turn
1079           this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1080           T400CDT. This is off by default since most machines do fine without
1081           this feature.
1082
1083 config APM_CPU_IDLE
1084         bool "Make CPU Idle calls when idle"
1085         depends on APM
1086         help
1087           Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1088           On some machines, this can activate improved power savings, such as
1089           a slowed CPU clock rate, when the machine is idle. These idle calls
1090           are made after the idle loop has run for some length of time (e.g.,
1091           333 mS). On some machines, this will cause a hang at boot time or
1092           whenever the CPU becomes idle. (On machines with more than one CPU,
1093           this option does nothing.)
1094
1095 config APM_DISPLAY_BLANK
1096         bool "Enable console blanking using APM"
1097         depends on APM
1098         help
1099           Enable console blanking using the APM. Some laptops can use this to
1100           turn off the LCD backlight when the screen blanker of the Linux
1101           virtual console blanks the screen. Note that this is only used by
1102           the virtual console screen blanker, and won't turn off the backlight
1103           when using the X Window system. This also doesn't have anything to
1104           do with your VESA-compliant power-saving monitor. Further, this
1105           option doesn't work for all laptops -- it might not turn off your
1106           backlight at all, or it might print a lot of errors to the console,
1107           especially if you are using gpm.
1108
1109 config APM_RTC_IS_GMT
1110         bool "RTC stores time in GMT"
1111         depends on APM
1112         help
1113           Say Y here if your RTC (Real Time Clock a.k.a. hardware clock)
1114           stores the time in GMT (Greenwich Mean Time). Say N if your RTC
1115           stores localtime.
1116
1117           It is in fact recommended to store GMT in your RTC, because then you
1118           don't have to worry about daylight savings time changes. The only
1119           reason not to use GMT in your RTC is if you also run a broken OS
1120           that doesn't understand GMT.
1121
1122 config APM_ALLOW_INTS
1123         bool "Allow interrupts during APM BIOS calls"
1124         depends on APM
1125         help
1126           Normally we disable external interrupts while we are making calls to
1127           the APM BIOS as a measure to lessen the effects of a badly behaving
1128           BIOS implementation.  The BIOS should reenable interrupts if it
1129           needs to.  Unfortunately, some BIOSes do not -- especially those in
1130           many of the newer IBM Thinkpads.  If you experience hangs when you
1131           suspend, try setting this to Y.  Otherwise, say N.
1132
1133 config APM_REAL_MODE_POWER_OFF
1134         bool "Use real mode APM BIOS call to power off"
1135         depends on APM
1136         help
1137           Use real mode APM BIOS calls to switch off the computer. This is
1138           a work-around for a number of buggy BIOSes. Switch this option on if
1139           your computer crashes instead of powering off properly.
1140
1141 endmenu
1142
1143 source "arch/i386/kernel/cpu/cpufreq/Kconfig"
1144
1145 endmenu
1146
1147 menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
1148
1149 config PCI
1150         bool "PCI support" if !X86_VISWS
1151         depends on !X86_VOYAGER
1152         default y if X86_VISWS
1153         help
1154           Find out whether you have a PCI motherboard. PCI is the name of a
1155           bus system, i.e. the way the CPU talks to the other stuff inside
1156           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1157           VESA. If you have PCI, say Y, otherwise N.
1158
1159           The PCI-HOWTO, available from
1160           <http://www.tldp.org/docs.html#howto>, contains valuable
1161           information about which PCI hardware does work under Linux and which
1162           doesn't.
1163
1164 choice
1165         prompt "PCI access mode"
1166         depends on PCI && !X86_VISWS
1167         default PCI_GOANY
1168         ---help---
1169           On PCI systems, the BIOS can be used to detect the PCI devices and
1170           determine their configuration. However, some old PCI motherboards
1171           have BIOS bugs and may crash if this is done. Also, some embedded
1172           PCI-based systems don't have any BIOS at all. Linux can also try to
1173           detect the PCI hardware directly without using the BIOS.
1174
1175           With this option, you can specify how Linux should detect the
1176           PCI devices. If you choose "BIOS", the BIOS will be used,
1177           if you choose "Direct", the BIOS won't be used, and if you
1178           choose "MMConfig", then PCI Express MMCONFIG will be used.
1179           If you choose "Any", the kernel will try MMCONFIG, then the
1180           direct access method and falls back to the BIOS if that doesn't
1181           work. If unsure, go with the default, which is "Any".
1182
1183 config PCI_GOBIOS
1184         bool "BIOS"
1185
1186 config PCI_GOMMCONFIG
1187         bool "MMConfig"
1188
1189 config PCI_GODIRECT
1190         bool "Direct"
1191
1192 config PCI_GOANY
1193         bool "Any"
1194
1195 endchoice
1196
1197 config PCI_BIOS
1198         bool
1199         depends on !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
1200         default y
1201
1202 config PCI_DIRECT
1203         bool
1204         depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
1205         default y
1206
1207 config PCI_MMCONFIG
1208         bool
1209         depends on PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
1210         default y
1211
1212 source "drivers/pci/pcie/Kconfig"
1213
1214 source "drivers/pci/Kconfig"
1215
1216 config ISA_DMA_API
1217         bool
1218         default y
1219
1220 config ISA
1221         bool "ISA support"
1222         depends on !(X86_VOYAGER || X86_VISWS)
1223         help
1224           Find out whether you have ISA slots on your motherboard.  ISA is the
1225           name of a bus system, i.e. the way the CPU talks to the other stuff
1226           inside your box.  Other bus systems are PCI, EISA, MicroChannel
1227           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
1228           newer boards don't support it.  If you have ISA, say Y, otherwise N.
1229
1230 config EISA
1231         bool "EISA support"
1232         depends on ISA
1233         ---help---
1234           The Extended Industry Standard Architecture (EISA) bus was
1235           developed as an open alternative to the IBM MicroChannel bus.
1236
1237           The EISA bus provided some of the features of the IBM MicroChannel
1238           bus while maintaining backward compatibility with cards made for
1239           the older ISA bus.  The EISA bus saw limited use between 1988 and
1240           1995 when it was made obsolete by the PCI bus.
1241
1242           Say Y here if you are building a kernel for an EISA-based machine.
1243
1244           Otherwise, say N.
1245
1246 source "drivers/eisa/Kconfig"
1247
1248 config MCA
1249         bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
1250         default y if X86_VOYAGER
1251         help
1252           MicroChannel Architecture is found in some IBM PS/2 machines and
1253           laptops.  It is a bus system similar to PCI or ISA. See
1254           <file:Documentation/mca.txt> (and especially the web page given
1255           there) before attempting to build an MCA bus kernel.
1256
1257 source "drivers/mca/Kconfig"
1258
1259 config SCx200
1260         tristate "NatSemi SCx200 support"
1261         depends on !X86_VOYAGER
1262         help
1263           This provides basic support for the National Semiconductor SCx200
1264           processor.  Right now this is just a driver for the GPIO pins.
1265
1266           If you don't know what to do here, say N.
1267
1268           This support is also available as a module.  If compiled as a
1269           module, it will be called scx200.
1270
1271 config HOTPLUG_CPU
1272         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1273         depends on SMP && HOTPLUG && EXPERIMENTAL
1274         ---help---
1275           Say Y here to experiment with turning CPUs off and on.  CPUs
1276           can be controlled through /sys/devices/system/cpu.
1277
1278           Say N.
1279
1280 source "drivers/pcmcia/Kconfig"
1281
1282 source "drivers/pci/hotplug/Kconfig"
1283
1284 endmenu
1285
1286 menu "Executable file formats"
1287
1288 source "fs/Kconfig.binfmt"
1289
1290 endmenu
1291
1292 source "net/Kconfig"
1293
1294 source "drivers/Kconfig"
1295
1296 source "fs/Kconfig"
1297
1298 source "arch/i386/oprofile/Kconfig"
1299
1300 source "arch/i386/Kconfig.debug"
1301
1302 source "security/Kconfig"
1303
1304 source "crypto/Kconfig"
1305
1306 source "lib/Kconfig"
1307
1308 #
1309 # Use the generic interrupt handling code in kernel/irq/:
1310 #
1311 config GENERIC_HARDIRQS
1312         bool
1313         default y
1314
1315 config GENERIC_IRQ_PROBE
1316         bool
1317         default y
1318
1319 config GENERIC_PENDING_IRQ
1320         bool
1321         depends on GENERIC_HARDIRQS && SMP
1322         default y
1323
1324 config X86_SMP
1325         bool
1326         depends on SMP && !X86_VOYAGER
1327         default y
1328
1329 config X86_HT
1330         bool
1331         depends on SMP && !(X86_VISWS || X86_VOYAGER)
1332         default y
1333
1334 config X86_BIOS_REBOOT
1335         bool
1336         depends on !(X86_VISWS || X86_VOYAGER)
1337         default y
1338
1339 config X86_TRAMPOLINE
1340         bool
1341         depends on X86_SMP || (X86_VOYAGER && SMP)
1342         default y
1343
1344 config PC
1345         bool
1346         depends on X86 && !EMBEDDED
1347         default y